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Archiv: SCR

1. Introduction
The selective catalytic reduction (SCR) of NO with NH3 process has been studied by many investigations in recent years with copper-based catalysts for conversion of NO, since the copper-containing catalysts (zeolite- and oxide-based catalysts) have high catalytic activity. The reduction mechanism of NO over Cu-zeolite, in the absence of oxygen, has been investigated and it was found that the CuO-based catalysts containing Cu-zeolite have a high activity for the reaction of NO with NH3.1,2 Also, CuO/zeolite catalyst has a distinct advantage of decreasing NH3 oxidation over other catalysts to remove NOx.3 T self-inhibiting effect of NOx in the SCR of NOx in a diesel engine over a Cu-zeolite catalyst has also been observed. This effect is strongest at lower temperatures (<250 °C) and became negligible above 300 °C.4 It is also reported that CuO/γ-Al2O3 catalyst has two possible reaction pathways of NO reduction to N2, one via a nitrosoamide-like intermediate and second via an ammonium nitrate-like intermediate or their equivalent Cu complexes [NO-Cu-NH2 and NO2-Cu-NH4, respectively]. The reaction mechanism of the SCR of NO with NH3 in the presence of O2 over CuO/γ-Al2O3 catalyst has also been summarized.

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2010 1 Feb

EGR vs SCR? Making sense of it all

Abgelegt unter: Grundlagen | RSS 2.0 | TB | Tags: , | Keine Kommentare

In 2010, the U.S. Environmental Protection Agency will be changing its emissions standard to two-tenths of a gram of nitrogen oxides per horsepower hour. This significant reduction will force the diesel engine industry to react strongly to meet the requirements. It’s not too soon to start thinking about which EPA-compliant engine you’ll be buying: a smaller, lighter one that requires urea as an additive, or a larger, heavier one that doesn’t. So – let’s start with the basics:

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Umweltgutachten 2008

Umweltschutz im Zeichen des Klimawandels, Hausdruck, Juni 2008

Vorwort
Im Berichtszeitraum seit dem Umweltgutachten 2004 wurde die Umweltpolitik in besonderer Weise von zwei Entwicklungen geprägt: zum einen von der Neuordnung der Gesetzgebungskompetenzen in Deutschland durch die Föderalismusreform, zum anderen durch die Fokussierung der Umweltpolitik auf die Risiken des Klimawandels.

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2008 7 Jun

Wie funktioniert BlueTEC

Abgelegt unter: Adblue, Allgemein, Video | RSS 2.0 | TB | Tags: , , | Keine Kommentare

Applied Thermal Engineering 27 (2007) 1790–1798

Abstract
In the automotive industry the selective catalytic reduction (SCR), which converts nitrogen oxides into nitrogen and water in the presence of a reducing agent, namely the so-called AdBlue urea–water solution, becomes major importance as a powerful emission reduction technique. Thermal engineering of SCR-tanks is a great challenge due to the melting and freezing behaviour of the AdBlue-fluid.

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